Engine valve mechanism.



N0. 737,68'7. PATENTED SEPT. 1. 1903. H. J. WESSINGER. ENGINE VALVE MECHANISM.

APPLIUATION FILED FEB. 24. 1903.

no-monm.

A; ATTORNEY.

INVENTOR.

WITNESSES UNITED STATES l atented September I,

PATENT OFFICE.

.Nomi VALVE MEoHAmsM.

SPECIFICATION forming part of Letters Patent N0. 73%,687, dated epternber 1, 1903 Application iiled Itbrutry 24, 1903. Serial No. 144.335. (No model.)

To a. 1072 0112 it may concern:

Beit known that I, HENRY J. WEssINGER, a citizen of the United States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in Engine Valve Mechanism and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

My invention relates to engine valve mechanism, and has for its object a construction in which the ports connecting the valve-chamber with the piston-chamber at or near each end of the same and the exhau st-ports maybe short, whereby the tendency for compressed air to freeze in them is avoided.

It has for its further object the provision of mechanism adapted to govern said ports.

With these and other objects in view it con sists of a body portion comprising a pistonchamber and a valve-chamber parallel with each other and connected with each other by a short tunnel or port penetrating the dividing-wall, between said chambers, at or near each end thereof.

It further consists of a piston within said piston-chamber, a reciprocating valve within said valve-chamber adapted to govern said ports, and means adapted to reciprocate said valve and to be actuated by said piston, said valve-chamber having another port formed in its exterior wall, at or near each end thereof, communicating with the atmosphere and adapted to be separated by said valve from communication with the first said ports and from communication with the central portion of said valvechamber.

It also consists of certain other constructions, combinations, and arrangements of parts, as will be hereinafter described and claimed. i

In the drawings, Figure 1 is a vertical longitudinal section on the line a a of Fig. at of a portion of a power-drill embodying my said formed exhaust-ports 6.

Fig. 0 is a detail of a modified form of hm port governing valve head and adjoining parts.

In the drawings, 1 is a body portion,in which is formed the piston-chamber 2 and the valve chamber 3,which chambers are approximately divided by the wall 4:- Through said Wall 4 and at or near each end thereof are formed short ports 5, through which communication may be had between said chambers 2 and 3.

Adjoining each of said ports 5 and opening into said chamber 3 and extending therefrom through the said wall 4 and through the outer wall of said body portion in any convenient direction, but not into said chamber 2, are Said chamber 3 is further apertured, as at '7, to receive a powersupply pipe. Within. said chamber 3 and 1ongitudinally central thereof, or approximately central thereof, is inserted a sliding block 8, of any suitable construction, recessed in one of its side faces, as at S), to receive the end of the upper arm of the.l1ereinafter-described rocker. Said recess is enlarged in any suitable manner at its mouth to afford play to said rocker-arm during the reciprocation of said block. A groove perpendicular to the longitudinal axis of said chamber 2 is formed in said body portion, as at 10', at a point longitudinally central thereof or approximately central thereof. A rocker, comprising a cen tral shaft 11, an arm 12, arranged at an angle thereto, a foot 13, and preferably a shoulder 14 and a heel 15, is loosely secured, partly in said groove 10, by a cover 16 of any suitable construction, which cover is bolted in any suitable manner to said body portion. The arm 12 of said rocker is directed toward and projects through a slot 10 in said body portion into the said recess 9 of said sliding block and loosely engages said block to actuate the same. Apiston 17 of anysuitable construction is slidably positioned in said chamber 2 and is diametricallyreduced, as at 18, intermediate of its ends, which reduction is preferably abrupt at one end and gradual at the other loo enlarged end of said piston,which actuation of said rocker will suddenly move said block 8 in the opposite direction to that in which said piston is then completing its movement. Said foot 13 is also formed with an opposite toe 21, adapted when said piston is at ornear the other end of its travel to be gradually pressed back into said slot by the gradually-enlarging end of said piston, which actuation of said rocker will gradually move said block 8 in the opposite direction to that in which said piston is then completing its movement. Secured in any suitable manner to said block 8 and extending therefrom in opposite directions, longitudinally of said chamber 3 and Within the same, are stems 22, the further ends of which respectively engage and govern slide-valves 23 and 24, which valves when constructed as shown in Figs. 1 to 3, inclusive, have formed in their faces adjoining said wall 4 a broad and shallow recess 25, adapted in a certain position of the respective valve to connect the corresponding port 5 with the corresponding adjoining port 6. In said last-named construction of said valve the valve-head preferably does not diametrically contact at all points with the walls of said chamber 3, or if it does so, as may be permitted, an aperture or tunnel is formed therein whereby the compressed air or other means of power can pass directly or indirectly to said port 5 when said valve is in proper position for that purpose.

In the modified construction shown in Fig. 6 the valve-head is spool-shaped, the annular ribs 26 and 27 of which spool-shaped portion contact at all points with the walls of said I chamber 3 or with a bushing or lining therein.

Said head is further formed with an extension 28, preferably of a diameter equal to the diam eter of the barrel of said spool-shaped portion between said ribs, which valve-head is longitudinally cored out and the walls of which extension 28 have apertures formed, as at 29, therein, connecting with the interior chamber of said head. A bushing 30 is also preferably interposed between the ribs of said valvehead and the walls of said chamber 3. In said modified form said exhaust-port 6 may be cut at any desired radial point through the exterior wall of said chamber 3 within the limits of the constant span of said ribs 26'and 27, as at 32.

In operation any suitable medium of power, but preferably compressed air, is admitted through the aperture 7 and fills, approximately, the whole of said chamber 3. \Vhen said piston is at one end of its travel, said rocker is actuated by said piston to operate said Valve to cut off communication between ports 5 and 6 and to uncover the port 5 to admit said compressed air or other medium to the chamber 2 in advance of the piston, which is just completing its travel toward that end of the chamber. At the same time and by the same actuation of said rocker the valve at the opposite end of the chamberis made to eifect or permit the communication of said port 5 at that end with said port 6, whereupon the exhaust at that end of the chamber 2 will escape through said port 5 and said port 6 to the outer atmosphere or to any suitable conduit arranged to conduct it away from said chamber.

I am aware that certain valve mechanism remotely similar in some features to my said invention are now well known to the art; but

in such constructions where the valve is actuated by the piston through a rocker the ports are so longas to incline compressed air when used to freeze therein.

While I have described certain details of my said construction, it is obvious that it may tion with a body portion, containing a pistonchamber and a valve-chamber, having feed and exhaust ports formed therein, and provided with a centrally-reduced piston within said ports, of a rockerhaving a shank portion In testimony whereof I hereunto affiX my signature in presence of two witnesses.

HENRY J. WESSINGER. Witnesses:

JEssIE L. CooLEY, JAMES T. \VA'rsoN.

said piston-chamber, and areciprocatingvalve .within said valve-chamber, adapted to govern IOC provided at one end with angular branches and having its shank portion journaled in said body portion at an angle to said piston, with its branches extending parallel with said piston, when said valve is on center, said l branches being provided at their opposite ends with angular extensions directed toward isaid piston and adapted, alternately, to en- ,Eg'age said piston intermediate of the ends ';thereof, said rocker having formed thereon, at the other end of said shank portion, an angular arm, adapted to engage said valve, 'to thrust the same in the opposite direction to the travel of said piston, substantially as described. 

